I wish I had seen this earlier...I think the idea about resetting all the gauges at 4 and then move slightly from there. Also be sure to rethread upper thread with presser foot up. If the bobbin needs tightening or loosening, do in 1/4 turns of the screw. Try working with the upper thread first. And remember that the upper thread tension shows up on the bottom of the fabric and the bobbin tension on the top of the fabric. Seems backwards, doesn't it.